Analysis of slit rotor slot of high speed SRIM and comparison with double cage rotor slot

An attempt has been made to analyze the methods to improve the electromagnetic properties of a solid-rotor high speed induction motor. The slitting patterns of the solid rotor are examined. It is shown how the slitting parameters affect the produced torque. The paper considered the effect of variation of slit depth and slit width for two materials with different electrical properties, on the performance of 180 kW, 170 Hz 3-phase induction motor using Flux-2D Maxwell software package from ANSYS. It is found that deeper rotor slit gives better and higher starting torqueas well as maximum torque. Also a comparative study with a double cage rotor slot is presented which leads to further improvement of running performance of the high speed induction motor.